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1.
Sarcastic slang used to blame all the your life problems on the President, Barack Obama.

Usually, the subject is struggling with a simple task or something trivial is happening to them.
"I stepped out in the middle of the street this morning and almost got hit by a car....Thanks Obama!"

"I just got a paper cut...Thanks Obama!"
by Sarah N Dipity August 22, 2013
 
2.
A phrase (used sarcastically) to blame one's problems on the president, regardless of whether or not they have anything to do with the presidency.
"Miley Cyrus was still Hannah Montana when George Bush was president--- Thanks Obama!"
by sophiachicken September 22, 2013